XML垂直线不在真实设备上绘制

我有一个列表项目布局，并且此布局用于StickyListHeaderListView，并在图像后面包含垂直分隔符。问题在于尽管在预览屏幕上绘制了视图分隔符，但从未在真实设备上绘制视图分隔符。XML垂直线不在真实设备上绘制

下面是XML布局代码

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:minHeight="80dp" 
     android:paddingLeft="@dimen/padding_medium" 
     android:paddingRight="@dimen/padding_medium" 
     tools:ignore="MissingPrefix"> 

<TextView 
    android:id="@+id/textview_date" 
    fontPath="@string/font_semi_bold" 
    android:layout_width="wrap_content" 
    android:maxWidth="60dp" 
    android:layout_height="match_parent" 
    android:layout_centerVertical="true" 
    android:gravity="center_vertical|right" 
    android:textAppearance="@android:style/TextAppearance.Holo.Medium" 
    android:textColor="#999999" 
    tools:text="21\nFeb" /> 

<RelativeLayout 
    android:id="@+id/container" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_toRightOf="@+id/textview_date" 
    android:minWidth="50dp" 
    android:paddingLeft="@dimen/padding_extra_small" 
    android:paddingRight="@dimen/padding_extra_small"> 

    <View 
     android:layout_width="1px" 
     android:layout_height="match_parent" 
     android:layout_centerHorizontal="true" 
     android:background="#999999" /> 
    <ImageView 
     android:layout_width="40dp" 
     android:layout_height="40dp" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="@dimen/margin_small" 
     android:src="@drawable/test_event_cat_1" /> 
</RelativeLayout> 

<TextView 
    android:id="@+id/textview_event_name" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_toRightOf="@+id/container" 
    android:layout_marginTop="@dimen/margin_small" 
    android:textColor="#999999" 
    fontPath="@string/font_medium" 
    tools:text="ACS Nights’ Soccer Finale" 
    android:textAppearance="@android:style/TextAppearance.Holo.Medium" /> 
<TextView 
    android:id="@+id/textview_interval" 
    android:layout_width="match_parent" 
    android:textAppearance="@android:style/TextAppearance.Holo.Small" 
    android:layout_alignLeft="@+id/textview_event_name" 
    android:layout_below="@id/textview_event_name" 
    android:layout_marginTop="@dimen/margin_small" 
    android:textColor="#999999" 
    tools:text="4:00 PM - 6:00 PM" 
    android:layout_height="wrap_content" /> 
</RelativeLayout>

该代码中的Android Studio中

Android Studio Preview Output